- Important Preliminary Checks

Before using this section, perform the "On-Board Diagnostic (OBD) System Check" and verify all of the following items:

- Testing and Inspection
- Powertrain Control Module (PCM) and Malfunction Indicator Lamp (MIL) (Service Engine Soon) are operating correctly.
- There are no DTC(s) stored.
- Scan tool data is within normal operating range. Refer to Scan Tool Diagnostics. Scan Tool Data List
- Verify the customer complaint and locate the correct symptom. Perform the procedure included in the symptom chart.